/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.classfile.editor;

import proguard.classfile.attribute.*;

/**
 * This class can add line numbers to a given line number table attribute. Line numbers to be added must have been
 * filled out beforehand.
 *
 * @author Eric Lafortune
 */
public class LineNumberTableAttributeEditor {
    private LineNumberTableAttribute targetLineNumberTableAttribute;

    /**
     * Creates a new LineNumberTableAttributeEditor that will edit line numbers in the given line number table
     * attribute.
     */
    public LineNumberTableAttributeEditor(LineNumberTableAttribute targetLineNumberTableAttribute) {
        this.targetLineNumberTableAttribute = targetLineNumberTableAttribute;
    }

    /**
     * Adds a given line number to the line number table attribute.
     */
    public void addLineNumberInfo(LineNumberInfo lineNumberInfo) {
        int lineNumberTableLength = targetLineNumberTableAttribute.u2lineNumberTableLength;
        LineNumberInfo[] lineNumberTable = targetLineNumberTableAttribute.lineNumberTable;

        // Make sure there is enough space for the new lineNumberInfo.
        if (lineNumberTable.length <= lineNumberTableLength) {
            targetLineNumberTableAttribute.lineNumberTable = new LineNumberInfo[lineNumberTableLength + 1];
            System.arraycopy(lineNumberTable, 0, targetLineNumberTableAttribute.lineNumberTable, 0,
                lineNumberTableLength);
            lineNumberTable = targetLineNumberTableAttribute.lineNumberTable;
        }

        // Add the lineNumberInfo.
        lineNumberTable[targetLineNumberTableAttribute.u2lineNumberTableLength++] = lineNumberInfo;
    }
}